package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    public SetmealDishMapper setmealDishMapper;

    /**
     * 新增菜品和对应口味
     *
     * @param dishDTO
     */
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //向菜品表插入1条数据
        dishMapper.insert(dish);
        //获取菜品插入后的id值
        Long id = dish.getId();

        //向口味表插入n条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            //把菜品id赋值给口味的菜品id属性
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(id);
            });
            //有数据,向口味表插入数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }


    /**
     * 菜品分页查询
     *
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());

        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }


    /**
     * 菜品批量删除
     *
     * @param ids
     */
    @Override
    public void deleteBatch(List<Long> ids) {
        //判断当前当前是否起售中,是就不能删除
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE) {
                //当前菜品不能删除,在起售中
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //判断是否被套餐关联,是就不能删除
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && setmealIds.size() > 0) {
            //表示当前菜品被套餐关联了
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //删除菜品数据 TODO 一个个遍历容易产生性能浪费,优化代码
//        for (Long id : ids) {
//            dishMapper.deleteById(id);
//            //删除关系的口味数据
//            dishFlavorMapper.deleteByDishId(id);
//        }
        //sql:delete * from *** where id in (1,2,3,4...)

        //批量删除菜品数据
        dishMapper.deleteByIds(ids);
        //批量删除口味数据
        dishFlavorMapper.deleteByDishIds(ids);

    }



    /**
     * 根据id查询菜品信息
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {

        //先根据id查询菜品数据
        Dish dish = dishMapper.getById(id);

        //根据菜品id查询口味表数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);

        //封装数据到DishVo
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }



    /**
     * 修改菜品表信息
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        //把数据复制到Dish类中
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //先修改菜品表信息
        dishMapper.update(dish);

        //删除口味表原有的数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //插入口味信息
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            //把菜品id赋值给口味的菜品id属性
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            //有数据,向口味表插入数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }


    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

    /**
     * 根据分类ID查询菜品信息
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * 设置套餐起售情况
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);
    }
}

















